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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db39045badd559043eaf815462ca67f9afe299de9e63b2855bd06d331a759b2e' 
  AND token = 'oZg3ISGNGg6ZBo6Pjs3jl27enXXcoGNHrW7/BxJ1tW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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