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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58aa6ea125f3690fd082734cd1063335431d88f39267bbef75ac00be8684ef21' 
  AND token = 'TBEsMGsr7upupsLAgHjs8+ev76xtpIovV3jFdJA6DG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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