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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d7ccbb0dd21639093987aa201231180eedc7b6f88c6b5ebdef6c5629c9e196b' 
  AND token = '1ht2EcAM9pBdzPhNlmSOevjLRBc0VwKxHb7SzJSeKbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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