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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cadc56c8cd6f1cecf8df61774a036ee42df979dcc0c1dc759399f90b35480fa4' 
  AND token = 'n4RXYjgNOAtxMByywmmHNZ1CMwStcMRcnRVJuABQ2ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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