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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63e32c01ecde7a683f05eec68a1ac33353728b2b43e959c15974be84a0ca064' 
  AND token = 'urkiYtR1PuVG+y1s2+VHyQdOsXCKKqrO39WLV4D4Cns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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