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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61a2e453c5756ceedc43bbc1959cd49b875f3794a512d48bd9392f7089cb89a' 
  AND token = 'wbdS0NWc0HEurVM8J5DZPX3Vp2OXd8PALREdqMZ+fvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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