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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14c112f4c917036f68d7719f1ff3077ebe3f2dbc16afe0e9961b4f5265984704' 
  AND token = 'B7aISiEq2lE+sCCwxGLJoQRc3P5agghLAgMwP4lo6TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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