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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c101111eb0a1933f191e29adc14a2201f6d0a6403d6b16e4d166e392f933b6fd' 
  AND token = 'UH9Ipg/ElwW4+0ga3yyzb8cq27tG532kecJ9zKzfVsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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