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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7df562e18950750cabc7dad8ca4c74557577d0b2103b0f96eb2b9e0000d217c' 
  AND token = 'NmNn+01dGHNXQXROAZFCgv+X/UH7/H1QjJZFlJqoW4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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