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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c122892f88a8e2cdf474bdb5bfccfe267d21ec5568d08719808e6ede0c3006e9' 
  AND token = '+ql7o9FvUfZCPIzkJAcHzpICpeZyRJjFO3q/KJEdscI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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