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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9981f31042c7b2055e53baa928248f9ea0b7f41b30b7208a91514e34e49c5fa2' 
  AND token = 'eKTOVHAdhZsTgpKcz16FzTc1sRTqBQi1UZW6cE/ShNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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