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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eff836cfd789b1064ed8836b03b4cc9f7d587343424e09e1d2e5ef0c3aa6e198' 
  AND token = 'm7qyW+jg++fvSeRXAt3/5V1bG6fVtZ3Ok3HZTylcsrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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