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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '575095a3c757d6b0f31d46744cadbf63b78250af1c885339eea91339eaa41e9c' 
  AND token = 'i/Mp043L1oBGp9g5XcOF4Bhk96AsHcMleJ9NaTtlesU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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