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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '750e4eed0e320365376c2a8047cef64603620ae5e8701d4c78ea902b59fa92c0' 
  AND token = '6IJpMLunx4AHT55l1Ko4iEnvdU604QUQ2B78GUGuGrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}